Table 1. Classification of primary graft dysfunction.

Grade	Pulmonary edema on chest X-ray	PaO2/FiO2 ratio	SaO2/FiO2 ratio
0	No	Any	Any
1	Yes	>300	>315
2	Yes	200–300	235–315
3	Yes	<200	<235

PaO₂, partial pressure of oxygen; FiO₂, fraction of inspired oxygen; SaO₂, oxygen saturation.